Morrison, Donald F., author
McGraw-Hill International Book Company, 1983
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Morrison, Donald F., author
McGraw-Hill, 1990
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Tabachnick, Barbara G., author
Allyn and Bacon, 2001
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Cooley, William W., author
John Wiley & Sons, 1971
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Lebart, Ludovic
John Wiley & Sons, 1984
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